256677 has 8 divisors (see below), whose sum is σ = 347616. Its totient is φ = 168432.

The previous prime is 256661. The next prime is 256687. The reversal of 256677 is 776652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256677 - 2⁴ = 256661 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a d-powerful number, because it can be written as 2¹⁷ + 5³ + 6 + 6⁵ + 7² + 7⁶ .

It is a plaindrome in base 10.

It is a nialpdrome in base 4.

It is a zygodrome in base 4.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 256677.

It is not an unprimeable number, because it can be changed into a prime (256687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 438 + ... + 839.

It is an arithmetic number, because the mean of its divisors is an integer number (43452).

2²⁵⁶⁶⁷⁷ is an apocalyptic number.

It is an amenable number.

256677 is a deficient number, since it is larger than the sum of its proper divisors (90939).

256677 is a wasteful number, since it uses less digits than its factorization.

256677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1347.

The product of its digits is 17640, while the sum is 33.

The square root of 256677 is about 506.6330032677. The cubic root of 256677 is about 63.5519652333.

The spelling of 256677 in words is "two hundred fifty-six thousand, six hundred seventy-seven".